High-$T_{\rm c}$ Superconducting High Gradient Magnetic Separator Using Solid Nitrogen Cooling System for Purification of CMP Wastewater

Song, Jung-Bin; Kim, Kwang Lok; Yang, D. G.; Kim, Young-Gyun; Lee, Jong-Seok; Ahn, Min Cheol; Lee, Haigun

doi:10.1109/tasc.2013.2255950

Cited by 19 publications

(6 citation statements)

References 11 publications

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“…Also as with the SN2 plot in figure 2, the cold chamber temperature remained at 35.6 K for a period of time, here, ∼0.5 day, owing to the latent heat (8.3 J cm −3 ) of the SN2 phase. This SN2 thermal mass enhancer design concept for the LHe-free magnets has been studied by others [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. It should be noted here that GE was the first manufacturer in the early 1990s to market LHe-free superconducting MRI magnets when it introduced all-Nb 3 Sn, cryocooled MRI magnets operating at 10 K, the practical upper temperature for Nb 3 Sn [20].…”

Section: Magnet Performancementioning

confidence: 97%

“…This SN2 thermal mass enhancer design concept for the LHe-free magnets has been studied by others [6–19]. It should be noted here that GE was the first manufacturer in the early 1990s to market LHe-free superconducting MRI magnets when it introduced all-Nb 3 Sn, cryocooled MRI magnets operating at 10 K, the practical upper temperature for Nb 3 Sn [20].…”

Section: 1st Sn2-hts Magnetmentioning

confidence: 99%

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Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience

Iwasa

2017

Supercond. Sci. Technol.

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In this article I present our experience at the Magnet Technology Division of the MIT Francis Bitter Magnet Laboratory on liquid-helium (LHe)-free, persistent-mode MgB2 MRI magnets. Before reporting on our MgB2 magnets, I first summarize the basic work that we began in the late 1990s to develop LHe-free, high-temperature superconductor (HTS) magnets cooled in solid cryogen—I begin by discussing the enabling feature, particularly of solid nitrogen (SN2), for adiabatic HTS magnets. The next topic is our first LHe-free, SN2-HTS magnet, for which we chose Bi2223 because in the late 1990s Bi2223 was the only HTS available to build an HTS magnet. I then move on to two MgB2 magnets, I and II, developed after discovery of MgB2 in 2000. The SN2-MgB2 Magnet II—0.5-T/240-mm, SN2-cooled, and operated in persistent mode—was completed in January 2016. The final major topic in this article is a tabletop LHe-free, persistent-mode 1.5-T/70-mm SN2-MgB2 “finger” MRI magnet for osteoporosis screening—we expect to begin this project in 2017. Before concluding this article, I present my current view on challenges and prospects for MgB2 MRI magnets.

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Section: Magnet Performancementioning

confidence: 97%

Section: 1st Sn2-hts Magnetmentioning

confidence: 99%

Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience

Iwasa

2017

Supercond. Sci. Technol.

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“…Since the 1990s, extensive studies have focused on the use of superconducting magnets in HGMS due to their inherent advantages. Chemical-mechanical-planarization waste water, [4] organic dyes, [5] phosphate, [3] arsenic, [6] electroless plating waste, [7] and oil field waste water [8] have successfully been treated using high-gradient superconducting magnetic separation (HGSMS).…”

Section: Introductionmentioning

confidence: 99%

Feasibility of turbidity removal by high-gradient superconducting magnetic separation

Zeng

Li²,

et al. 2015

Environmental Technology

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Several studies have focused on pollutant removal by magnetic seeding and high-gradient superconducting magnetic separation (HGSMS). However, few works reported the application of HGSMS for treating non-magnetic pollutants by an industrial large-scale system. The feasibility of turbidity removal by a 600 mm bore superconducting magnetic separation system was evaluated in this study. The processing parameters were evaluated by using a 102 mm bore superconducting magnetic separation system that was equipped with the same magnetic separation chamber that was used in the 600 mm bore system. The double-canister system was used to process water pollutants. Analytical grade magnetite was used as a magnetic seed and the turbidity of the simulated raw water was approximately 110 NTU, and the effects of polyaluminum chloride (PAC) and magnetic seeds on turbidity removal were evaluated. The use of more PAC and magnetic seeds had few advantages for the HGSMS at doses greater than 8 and 50 mg/l, respectively. A magnetic intensity of 5.0 T was beneficial for HGSMS, and increasing the flow rate through the steel wool matrix decreased the turbidity removal efficiency. In the breakthrough experiments, 90% of the turbidity was removed when 100 column volumes were not reached. The processing capacity of the 600 mm bore industry-scale superconducting magnetic separator for turbidity treatment was approximately 78.0 m(3)/h or 65.5 × 10(4) m(3)/a. The processing cost per ton of water for the 600 mm bore system was 0.1 $/t. Thus, the HGSMS separator could be used in the following special circumstances: (1) when adequate space is not available for traditional water treatment equipment, especially the sedimentation tank, and (2) when decentralized sewage treatment HGSMS systems are easier to transport and install.

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“…Recently, high-gradient magnetic separation (HGMS) has been researched for the development of highly compact wastewater treatment systems [6][7][8][9][10]. The use of a superconducting magnet enhances the filtration performance of the HGMS system, because the absence of Joule heating losses leads to the facile generation of high magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study, we developed a 3 T/60 mm high-T c superconducting (HTS) HGMS system using a solid nitrogen cooling system [6]. In order to investigate the effects of filter shapes on the capture efficiency of the HTS-HGMS system in this study, we designed and fabricated various filters with different wire diameters and packing fractions.…”

Section: Introductionmentioning

confidence: 99%

Effects of filter shapes on the capture efficiency of a superconducting high-gradient magnetic separation system

Kim¹,

Song²,

Yang³

et al. 2013

Supercond. Sci. Technol.

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This paper reports experimental and analytical studies on the capture efficiency of a superconducting high-gradient magnetic separation (HGMS) system, employing ferromagnetic filters with various wire diameters and packing fractions. The magnetization force was inversely proportional to wire diameter because the magnetic field gradient increased with decreasing wire diameter. In addition, the capture efficiency of the HGMS system was increased with decreasing wire diameter and increasing packing fraction. The experimental results from the filtration tests via the superconducting HGMS system were in reasonably good agreement with the capture efficiency using the magnetization force obtained by magnetic field analysis.

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High-$T_{\rm c}$ Superconducting High Gradient Magnetic Separator Using Solid Nitrogen Cooling System for Purification of CMP Wastewater

Cited by 19 publications

References 11 publications

Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience

Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience

Feasibility of turbidity removal by high-gradient superconducting magnetic separation

Effects of filter shapes on the capture efficiency of a superconducting high-gradient magnetic separation system

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High-$T_{\rm c}$ Superconducting High Gradient Magnetic Separator Using Solid Nitrogen Cooling System for Purification of CMP Wastewater

Cited by 19 publications

References 11 publications

Towards liquid-helium-free, persistent-mode MgB2MRI magnets: FBML experience

Towards liquid-helium-free, persistent-mode MgB2MRI magnets: FBML experience

Feasibility of turbidity removal by high-gradient superconducting magnetic separation

Effects of filter shapes on the capture efficiency of a superconducting high-gradient magnetic separation system

Contact Info

Product

Resources

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Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience

Towards liquid-helium-free, persistent-mode MgB₂MRI magnets: FBML experience